These short rainboots are designed with Ilse Jacobsen's classic flat EVA sole to help withstand even the hardest torrential downpour and help you love the rain. Made with rubber from sustainable harvests, the fundamental composition is 80% pure, natural rubber and 20% secret recipe. contains no animal by-products. To make sure that your feet stay dry and comfortable, these rain boots are lined with a mixture of 60% viscose and 40% cotton. Whislt the EVA soles contain 45% rubber 35% polyester & 20% polyacrylic and can withstand temperatures down to -40 degrees Celsius, and the rubber uppers down to -20 degrees Celsius."